Television receiving apparatus having a video tape recorder unit therein

Abstract: A television receiving apparatus (1) having a video tape recorder unit (7) therein, for preventing a user from inserting his fingers into a cabinet (2) when the video tape recorded unit is removed from the cabinet for repair of the like, includes a locking mechanism of a controller door panel (10) at a position where it is closed. The controller door panel (10) is used for operating the video tape recorder unit contained in the apparatus. In order to surely obtain security of the user even when the locking operation is forgotten, the apparatus further includes a mechanism for interrupting supply of electric power to a television receiver when the absence of the video tape recorder unit in the cabinet is detected and when the controller door panel is detected to be opened at and more a predetermined angle. According to the invention, a possibility that the user will receive an electric shock can thus be eliminated.

Description: FIELD OF THE INVENTION The present invention relates to a television receiving apparatus having a video tape recorder unit therein, which apparatus is structured to eliminate a risk that a user will receive a dangerous electric shock. BACKGROUND OF THE INVENTION In a conventional television receiving apparatus accommodating a video tape recorder unit therein, a tuner device and an audio system used for a television receiver are often incorporated in the video tape recorder unit. Accordingly, when the video tape recorder unit is absent in a cabinet of the apparatus because of repair, for example, the television receiver cannot receive television broadcasting. In contrast, in a television receiving apparatus having a video tape recorder unit therein according to the present invention, a television receiver itself including a tuner device and an audio system, and a video tape recorder unit are accommodated in a common cabinet. It is therefore possible to receive the television broadcasting by the television receiver even if the video tape recorder unit is not present in the cabinet. In this case, however, when a user who does not know the absence of the video tape recorder unit in the cabinet, tries to use the video tape recorder unit during operation of the television receiver, there is a risk that the user will undesirably insert his fingers into the cabinet and receive an electric shock. Document DE 34 44 285 A discloses an apparatus according to the preamble of claim 1. SUMMARY OF THE INVENTION It is an object of the invention to provide a television receiving apparatus having a video tape recorder unit therein which can eliminate the risk of the electric shock as mentioned above. According to the invention, a television receiving apparatus having a video tape recorder unit therein, comprises: a cabinet; a television receiver housed in the cabinet, and including a tuner device and an audio system installed therein; a video tape recorder unit detachably accommodated in the cabinet, connected to the television receiver and having an opening portion through which a video tape cassette is inserted or discharged; a controller door panel provided on the cabinet and adapted to open or close in correspondence to the opening portion of the video tape recorder unit and an opening or closing mechanism for the controller door panel; first detection means for detecting absence of the video tape recorder unit in the cabinet; second detection means for detecting that the controller door panel is opened at a predetermined angle or more than said angle; and means for interrupting supply of electric power to the television receiver when the first detection means detects the absence of the video tape recorder unit in the cabinet and the second detection means detects that the controller door panel is opened at the predetermined angle or more than said angle. According to the television receiving apparatus of the present invention, it includes the first detection means for detecting the absence of the video tape recorder unit when it is not present in the cabinet and the means for interrupting the supply of electric power to the television receiver when the second detection means detects that the controller door panel is opened at and more the predetermined angle. Therefore, a danger of an electric shock which happens to the user can be eliminated. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is a partially cutaway perspective view of a television receiving apparatus having a video tape recorder unit therein according to one embodiment of the present invention; Fig. 2 is a view illustrative of a door mechanism for a controller door panel of the embodiment shown in Fig. 1; Fig. 3 is a view of the same, schematically showing a structure of locking the controller door panel of the embodiment shown in Fig. 1; and Fig. 4 is a cross-sectional view of the door mechanism and a hold member in the embodiment of Fig. 1, taken along a line IV-IV of Fig. 3, when the operation door panel is locked. DETAILED DESCRIPTION OF THE EMBODIMENT Fig. 1 shows an embodiment of a television receiving apparatus 1 having a video tape recorder unit 7 therein, according to the present invention. A cabinet 2 accommodates a television receiver 4 having a cathode-ray tube, and a video tape recorder unit 7. This television receiver 4 itself includes a tuner device and an audio system independently of the video tape recorder unit, and accordingly, when the video tape recorder unit 7 is removed from the cabinet 2, the television receiver 4 can receive television broadcasting by itself. The video tape recorder unit 7 has an opening portion 11 on the front side through which a video tape cassette is inserted into or discharged from the unit. A user opens a controller door panel 10 of the cabinet 2 to expose the opening portion 11 for inserting or discharging the video tape cassette therethrough. When it is required to take out the video tape recorder unit 7 from the cabinet 2 for the purpose of repairing the unit to which a trouble happens, a service man opens a cover (not shown) of a rear casing portion 3 of the cabinet 2 to release the connection between the video tape recorder unit 7 and the television receiver 4 before the video tape recorder unit 7 is removed from the cabinet 2. When the video tape recorder unit 7 is disconnected from the television receiver 4, an information of the disconnection is given to a microcomputer 6 as, for example, a change in voltage of electrical connection terminals. The microcomputer 6 which has detected the above disconnection, recognizes that the video tape recorder unit 7 has been removed from the cabinet 2, or that the video tape recorder unit 7 is absent in the cabinet 2. The controller door panel 10 is swingably rotated about a shaft 9. The shaft 9 is operatably connected to a door mechanism 8, as shown in Fig. 2. When the controller door panel 10 is moved, a first gear 18 is rotated and a second gear 15 engaged with the first gear 18 is also rotated. A third gear 17 meshed with the second gear 15 is coupled to a damper mechanism 21 having an oil-contained dash pot. The damper mechanism 21 controls movement of the gear trains to thereby adjust a velocity of movement of the controller door panel 10 appropriately. Referring to Fig. 2, when the controller door panel 10 is moved in a direction of an arrow B at a predetermined angle from a position where it is closed, which is shown by a solid line, the second gear 15 rotates in a direction of an arrow A and pushes a limit switch 14. An information that the limit switch 14 has been pushed as the second detection means is sent to the microcomputer 6 illustrated in Fig. 1 so that the supply of electric power to the television receiver 4 is interrupted by the microcomputer 6 if the video tape recorder unit 7 is absent in the cabinet 2. However, when the video tape recorder unit 7 is present in the cabinet 2, the microcomputer 6 does not shut off the supply of the electric power to the television receiver 4 in response to the information that the limit switch 14 has been pushed. In the above-described embodiment, the microcomputer 6 is used as the first detection means for detecting that the video tape recorder unit 7 is absent in the cabinet 2. In the case where the video tape recorder unit 7 is not present in the cabinet 2, when the controller door panel is opened at and more the predetermined angle so as to push the limit switch, the microcomputer 6 also serves as means for interrupting the supply of electric power to the television receiver 4. Alternatively, those means may be replaced by any other similarly functioning means such as only a limit switch. Referring to Fig. 3, the second gear 15 is provided with a projection 16. In order to facilitate the understanding of the invention, the gear trains are positively omitted from Fig. 3, except for the projection 16. As shown in Fig. 3, when the controller door panel 10 is at a position where it is opened, which is indicated by an imaginary line, the projection 16 occupies a position indicated by an imaginary line. When the controller door panel 10 is at a position where it is closed, which is indicated by a broken line, the projection 16 occupies a position indicated by a broken line. A hold member 19 having a relatively narrow groove 20 is connected to the door mechanism 8 slidably in a direction of an arrow D. When the projection 16 is at the position indicated by the broken line, or when the controller door panel 10 is at the closed position, the hold member 19 retains the projection 16 in the groove 2 so that the projection 16 cannot move, as shown in Fig. 3. As a result, the controller door panel 10 is locked at that closed position. Fig. 4 is a cross-sectional view of the door mechanism 8 and the hold member 19, taken along a line IV - IV of Fig. 3, in which the projection 16 is held in the groove 20. As mentioned above, when there happens some trouble to the video tape recorder unit, the service man takes out the video tape recorder unit from the cabinet for repairing the same. Since the television receiver is independent of the video tape recorder unit, the television receiver can receive the television broadcasting by itself. However, when a user does not know or forgets the absence of the video tape recorder unit in the cabinet, and opens the controller door panel to use the video tape recorder unit, he may insert his fingers into the cabinet during operation of the television receiver. In such a case, there is a possibility that he will unfavorably touch a chassis of the television receiver or an electric circuit. This mistouch gives an electric shock to the user. In order to eliminate the dangerous electric contact, according to the invention, the television receiving apparatus having a video tape recorder unit therein includes the two means which has been described above. More specifically, one of those means serves to lock the controller door panel at the closed position. That is to say, when the service man removes the video tape recorder unit from the cabinet, the controller door panel can be locked at the closed position by the service man. Thus, since the user is prevented from inserting his fingers into the cabinet by error, he will not receive the electric shock. The other means serves to detect the absence of the video tape recorder unit in the cabinet and to interrupt the supply of electric power to the television receiver when the controller door panel is opened at and more the predetermined angle. That is to say, as shown in Fig. 2, when the controller door panel is opened, the second gear 15 movably engaged with the controller door panel pushes the limit switch 14. In the case where the microcomputer 6 (see Fig. 1) detects the absence of the video tape recorder unit in the cabinet, when the limit switch 14 is pushed, the microcomputer 6 interrupts the supply of electric power to the television receiver. Therefore, even if the service man forgets to lock the controller door panel at the closed position, there is no possibility that the user will receive the electric shock.

Claims: A television receiving apparatus having a video tape recorder unit therein, comprising: a cabinet (2); an independent television receiver (4) housed in said cabinet, and including a tuner device and an audio system; a video tape recorder unit (7) detachably accommodated in said cabinet, connected to said television receiver, and having an opening portion (11) through which a video tape cassette is inserted or discharged; and a controller door panel (10) provided on said cabinet and adapted to open or close in correspondence to the opening portion of said video tape recorder unit, and an opening or closing mechanism for the controller door panel; characterised by further comprising first detection means (6) for detecting the absence of said video tape recorder unit in said cabinet; second detection means (14) for detecting that said controller door panel is opened at a predetermined angle or more than said angle; and means (6) for interrupting supply of electric power to said television receiver when said first detection means detects the absence of the video tape recorder unit in said cabinet and said second detection means detects that said controller door panel is opened at the predetermined angle or more than said angle. A television receiving apparatus having a video tape recorder unit therein according to Claim 1, wherein said first detection means for detecting the absence of said video tape recorder unit in said cabinet comprises a microcomputer. A television receiving apparatus having a video tape recorder unit therein according to Claim 2, wherein said second detection means (14) for detecting that said controller door panel is opened at the predetermined angle or more than said angle is a limit switch. A television receiving apparatus having a video tape recorder unit therein according to Claim 3, wherein said opening or closing mechanism of said controller door panel includes a member (15) movable in co-operation with said controller door panel. A television receiving apparatus having a video tape recorder unit therein according to Claim 4, wherein at least a part of said movable member (15) includes a toothed portion. A television receiving apparatus having a video tape recorder unit therein according to Claim 5, wherein said apparatus further comprises damper means (21) for adjusting a velocity of opening or closing movement of said controller door panel in co-operation with the toothed portion of the movable member (15) included by said opening or closing mechanism. A television receiving apparatus having a video tape recorder unit therein according to Claim 6, wherein said limit switch is turned on or off by movement of the movable member (15) included by said opening or closing mechanism.

Inventors: KAGAWA TAKASHI, KOJIMA KAZUNOBU, MATSUOKA YUICHI, KAGAWA, TAKASHI, KOJIMA, KAZUNOBU, MATSUOKA, YUICHI
Applicants: MATSUSHITA ELECTRIC IND CO LTD, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 1994
Main classification: G11B31
IPC codes: G11B31